January in Miyako-jima is the cloudiest and the coldest month of the year. In January, the weather in Miyako-jima is typically warm. Average daily high temperature in January is about 20 degrees above zero. On average, Miyako-jima has 17 rainy, 7 cloudy, 4 sunny, and 3 partly cloudy days in January. The rains are usually heavy. January as well as February, March, May, and June is considered the most uncomfortable time to visit Miyako-jima.